Hoagies has some links on 2E that might be helpful:

http://www.hoagiesgifted.org/special_needs.htm
"[Twice exceptional] children may be gifted and ADD, gifted and dyslexic, gifted and just about any physical or learning disability you can imagine (and probably a few you can't)."

and http://www.hoagiesgifted.org/twice_exceptional.htm